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After try so much,I still cannot change backlight,calling for help!

1.My computer is HP g4-1061tx
2.I installed bt5 in my hardisk
3.there is nothing in /sys/class/backlight
4.when i move to brightness applet,it shows"cannot get laptop panel brightness"
5.I try to add "acpi_backlight=vendor" in grub,but it is no use
6.I use command "setpci 01:00:00 F4.B=E0", but it is no use too